[名词解释] 联合固氮作用 associative nitrogen fixation
[名词解释] 生物固氮作用(Biological nitrogen fixation)
[名词解释] 固定(fixation)
[名词解释] 氮循环 nitrogen cycle
[单选题]What happens to nitrogen in body tissues if a diver ascends too quickly?A.) It forms bubbles.B.) It goes directly to the brain.C.) It is reabsorbed by the lungs.D.) It has a narcotic effect.
[名词解释] 有机氮库 organic nitrogen pool
[问答题] 简述固氮酶固氮的条件?
[填空题] 英译中(Translate):biological nitrogen fixation()
[单选题]固氮螺菌属的固氮环境是()。A .植物根表和根圈B .豆科植物根瘤C .非豆科植物根瘤D .地衣
[单选题]Broadly speaking, the genes more active in the lonely__________ .A.helped t